Evaluation of SafTest™ methods for monitoring frying oil quality

Swee Yee Foo, Susan Cuppett, Vicki Schlegel

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


The feasibility of applying methods developed by Safety Associates, Inc., to monitor oil degradation products, including malondialdehydes (AldeSafe™), FFA (FASafe™), and peroxides (PeroxySafe™), in fresh and heat-abused deep-fat frying oil was evaluated. Based on performance qualification studies, the AldeSafe method was the most suitable SafTest™ assay for monitoring the quality of frying oil because of its high accuracy, precision, linearity, and reproducibility, and low detection/quantitation limits. A strong correlation (r= 0.924) between the AldeSafe method and its counterpart, AOCS Official Method Cd 19-90, also supported the suitability of the SafTest method for monitoring oil quality. Moreover, the FASafe method had a moderately strong relationship with AOCS Official Method Ca 5a-40 (r = 0.761). Our studies suggest that this test can be applied for monitoring frying oil; however, certain method performance limitations must be considered for routine analysis purposes. In contrast, the PeroxySafe method probably should not be used to monitor heat-abused oil without further development because of high variability, low accuracy, and low correlation (r= 0.062) with the AOCS Official Method Cd 8-53 assay.

Original languageEnglish (US)
Pages (from-to)15-20
Number of pages6
JournalJAOCS, Journal of the American Oil Chemists' Society
Issue number1
StatePublished - Jan 2006


  • Assay correlation
  • Deep frying
  • Free fatty acids
  • Malondialdehyde
  • Method qualification
  • Oil degradation products
  • Oil quality indicators
  • Peroxides

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Organic Chemistry


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